This repository is a collection of Garmin FIT Perl library and scripts for
converting Garmin FIT files to other formats.
Currently the following conversions are supported:
| Source | Destination | Extension | ||
 |
Garmin FIT |  |
GPX v1.1 | .gpx |
|
Garmin FIT |  |
SigmaSport log file | .slf |
|
Garmin FIT |  |
JavaScript Object Notation | .json |
|
Garmin FIT |  |
Text dump of all data records | .txt |
Main library for reading and parsing Garmin FIT file is a modified/updated version of Garmin::FIT library by Kiyokazu Suto. If you want to update Garmin::FIT library to the latest protocol/profile, use documentation from the official FIT SDK from thisisant.com Web site.
Currently supported FIT protocol and profile in this version of library is:
| FIT Protocol | FIT Profile | Released |
|---|---|---|
| 2.4 | 21.32 | 28-May-2020 |
Some of the messages and fields used in this implementation are not described in the latest official FIT SDK documentation and are therefore experimental/unsupported. This implementation was tested on FIT files from Garmin Edge device only. Other devices might produce FIT files which don't have all required fields. Scripts work in both Windows and Unix environments. Support for 64-bit integers is not tested at all.
Conversion scripts need to be run from the command line (there's no GUI).
You'll need the following Perl prerequisites:
- POSIX::strftime::GNU
- Data::UUID
- Config::Simple
You can install them with ppm on Windows (if you are using ActivePerl) or with cpan:
$ cpan install POSIX::strftime::GNU $ cpan install Data::UUID $ cpan install Config::Simple
You have to copy FIT files from your Garmin (or other) device to your computer. You'll need the activity FIT files only. On Garmin Edge devices these files are stored in \Garmin\Activity subdirectory. You can also do it via Garmin Connect Export option.
All conversion scripts can optionaly use config file in Windows ini format, which must be named as the script name with extension .ini and must reside in the current working directory. If the config file is not found, some reasonable defaults are applied.
Config file example (fit2slf.ini):
[default] ;SigmaSport: cycling, mountainbike, racing_bycicle (road bike), running, ... sport = mountainbike training_type = Riding bike = bike1 [personal] name = John Smith gender = male age = 40 height = 183 weight = 75 [bike1] name = Ibis Ripley 29 LS type = MTB weight = 12.3 wheel_size = 2326
Units used in config file and in scripts are metric (kg, cm, mm, ...).
Detailed syntax and parameters used in ini file is described in Config (ini) File Syntax.
Use fit2gpx.pl with optional config file fit2gpx.ini:
$ fit2gpx.pl input.fit
This produces file input.gpx in the current directory. If the file
input.gpx already exists, it will not be overwritten. To force overwrite,
use:
$ fit2gpx.pl -y input.fit
By default a GPX file compatible with Garmin's Track Point Extension Format v1 is produced. If you want to produce a GPX file compatible with a Cluetrust GPX Extension Format, use the following:
$ fit2gpx.pl -c input.fit
Difference between them is in the syntax how heart rate, cadence, temperature & power data is stored in the file. In both cases a Cluetrust extension <gpxdata:lap> (one for each lap) will be added to the end of file, where the following average/min/max values are stored:
startPoint, endPoint, startTime, elapsedTime, calories, distance, avg_speed, max_speed, min_altitude, avg_altitude, max_altitude, total_ascent, total_descent, distance_uphill, distance_downhill, avg_incline_uphill, avg_incline_downhill, avg_rise_rate_uphill, avg_rise_rate_downhill, min_heart_rate, max_heart_rate, min_percent_hrmax, avg_percent_hrmax, max_percent_hrmax, time_under_target_zone, time_in_target_zone, time_over_target_zone, avg_power, avg_power_KJ, avg_power_W_per_Kg, max_power, avg_cadence, max_cadence, min_temperature, avg_temperature, max_temperature, total_cycles, total_records
If input.fit contains power data from power meter, the real power
average will be used instead of calculated one.
Use fit2slf.pl with optional config file fit2slf.ini:
$ fit2slf.pl input.fit
This produces file input.slf in the current directory. If the file
input.slf already exists, it will not be overwritten. To force overwrite,
use:
$ fit2slf.pl -y input.fit
A lot of calculation of average/min/max values is done in addition to the
data found in FIT file. Specifically, power is calculated according to the
formulas described in J.C. Martin's paper
Validation of a Mathematical Model for Road Cycling Power
from 1998. You can change some of the parameters used for power calculation
in ini file (see Config (ini) File Syntax). If input.fit contains
power data from power meter, the real power measurements will be used instead
of calculated ones.
Resulting input.slf can be directly imported in SigmaSport Data Center,
which is a perfect software for offline evaluation of cycling statistics
and training sessions.
Use fitdump.pl:
$ fitdump.pl -print_json=1 input.fit > input.json
If you want to include the units, which are switched off by default for JSON,
add command line switch -without_unit=0.
fitdump.pl reads the contents for Garmin .FIT files given on command line (or standard input if no file is specified), and prints them in human readable form. Usage:
$ fitdump.pl input.fit > input.txt or $ cat input.fit | fitdump.pl > input.txt
The following command line switches are available (see example for JSON above):
-semicircles_to_deg=(0|1) default: 1 -mps_to_kph=(0|1) default: 1 -use_gmtime=(0|1) default: 0 -maybe_chained=(0|1) default: 0 -print_json=(0|1) default: 0 -without_unit=(0|1) default: 0 (1 for print_json) -skip_invalid=(0|1) default: 0 (1 for print_json) -numeric_date_time=(0|1) default: 0 -show_version=(0|1) default: 0
Fields in .FIT files, which are not documented in FIT SDK, are named as
unknown<field_number>. New fields, which typically appear in newer
versions of FIT Profiles and Garmin::FIT library doesn't know them yet,
are named as xxx<field_number>.
fitdump.pl is written in a generic way and will read all versions of .FIT files (past and future).